They are essential to the design of the electric generator and electric motor and are also employed in doorbells, circuit breakers, television receivers, loudspeakers, atomic particle accelerators, and electromagnetic brakes and clutches. Electromagnetic propulsion systems can provide motive power for spacecraft. Electromagnets are also essential to magnetic levitation systems. Such systems often use a special kind of electromagnet whose coil is made of a superconducting metal.
Towards this end, they created electromagnets, a device that uses electrical current to induce a magnetic field. And since their initial invention as a scientific instrument, electromagnets have gone on to become a regular feature of electronic devices and industrial processes. Electromagnets are distinguished from permanent magnets in that they only display a magnetic attraction to other metallic objects when a current is passed through them.
This presents numerous advantages, in that the power of its magnetic attraction can be controlled, and turned on and off at will. It is for this reason that they are used extensively in research and industry, wherever magnetic interactions are called for.
The first recorded discovery of the relation between electricity and magnetism occurred in , when Danish scientist Hans Christian Orsted noticed that the needle on his compass pointed away from magnetic north when a nearby battery was turned on. This deflection convinced him that magnetic fields radiate from all sides of a wire carrying an electric current, just as light and heat do. Shortly thereafter, he published his findings, showing mathematically that an electric current produces a magnetic field as it flows through a wire.
Four years later, English scientist William Sturgeon developed the first electromagnet, which consisted of a horseshoe-shaped piece of iron wrapped with copper wire. When current passed through the wire, it would attract other pieces of iron, and when the current was stopped, it lost magnetization. Despite only weighing grams 7 ounces , it could lift objects that weighed approximately 4 kg 9 pounds with only the current of a single-cell battery. As a result, research began to intensify into both electromagnets and the nature of electrodynamics.
Nowadays electromagnetic fields play a key role in advanced medical equipments such as hyperthermia treatments for cancer, implants and magnetic resonance imaging MRI. RF range frequencies are mostly used in medical applications. In MRI scans, sophisticated equipment works based on the electromagnetism can scan minute details of the human body. The electromagnetic therapy is an alternate form of medicine which claims to treat disease by applying pulsed electromagnetic fields or electromagnetic radiation to the body.
This type of treatments is used for wide range of ailments such as nervous disorders, diabetes, spinal cord injuries, ulcers, asthma, etc. Many of the medical equipments such as scanners, x-ray equipments and other equipments uses electromagnetism principle for their functioning. This article was extremely helpful. Thank you so much! Your email address will not be published. Electromagnetism , Electronics Tutorials , General. Applications of Electromagnetism. September 19, By Administrator.
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